Facebook has released a new privacy feature called Off-Facebook Activity. The tool lets you see and control data that apps and websites share with Facebook.
Click Settings at the top right of Facebook on your personal page. Click Your Facebook Information at the left column then Off- Facebook Activity to review.
With the new privacy feature, you can clear the history of apps and websites that have shared your data.
Facebook knows the articles users read online and can learn a lot about you from this data. They also know every time you open a site with the Facebook app.